title: Salen complexes of zirconium and hafnium: synthesis, structural characterization, controlled hydrolysis, and solvent-free ring-opening polymerization of cyclic esters and lactides.
abstract: Dinuclear salen compounds of zirconium and hafnium are efficient initiators for the solvent-free ring-opening polymerization of cyclic ester monomers and lactides. There is a correlation between the theoretical and experimental number-average molecular weights (M(n)'s) in these polymerizations. Polymerization of β-butyrolactone gives poly(3-hydroxybutyrate) with a good M(n) and molecular weight distribution.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India.
authors.forename: Tanmoy Kumar
authors.initials: TK
authors.lastname: Saha
authors.forename: Venkatachalam
authors.initials: V
authors.lastname: Ramkumar
authors.forename: Debashis
authors.initials: D
authors.lastname: Chakraborty
mesh_terms: D018360:Crystallography, X-Ray; D004146:Dioxanes / Q000737:chemistry*; D004952:Esters / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry*; D006195:Hafnium / Q000737:chemistry*; D006868:Hydrolysis; D008958:Models, Molecular; D008968:Molecular Conformation; D008970:Molecular Weight; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry*
chemical_list: D004146:Dioxanes; D004952:Esters; D005029:Ethylenediamines; D009942:Organometallic Compounds; D012997:Solvents; C011452:disalicylaldehyde ethylenediamine; C091880:dilactide; D015040:Zirconium; D006195:Hafnium